Snap fit electrical connector assembly with conical outer snap fit retainer and externally mounted internal wire retainer

ABSTRACT

An electric connector assembly having a connector body defining an inlet end portion and an outlet end portion interconnected by a through bore wherein the outlet end portion is provided with a tapering frustro conical surface that is circumscribed by an external retainer ring of a frustro conical shape complementing the frustro conical outer surface of the outlet end portion. The conical external retainer ring also includes locking and grounding tangs arranged to effect a snap fit connection of the connector assembly to a knock-out hole of an electric box or panel. The electric connector assembly further contemplates the use of internal wire conductor retainer associated with the inlet end portion so as to effect the attachment of an electric wire conductor thereto with a snap fit in a manner that prohibits any unintentional separation of the electric wire conductor therefrom.

RELATED APPLICATIONS

This application is a continuation in part application of applicationSer. No. 11/151,374 filed Jun. 13, 2005 for Snap Fit ElectricalConnector Assembly With conical Outer Snap Fit Retainer And One Or MoreInternal Snap Fit Wire Retainers, which is a continuation in part ofapplication Ser. No. 11/100,250 filed Apr. 6, 2005 for Snap InElectrical Connector Assembly With Unidirectional Wire ConductorRetainer Ring, which is a continuation in part application ofapplication Ser. No. 10/939,619 filed Sep. 13, 2004 for ElectricalConnector With Frustro Conical Snap Fit Retaining Ring, now U.S. Pat.No. 6,916,988 BE.

FIELD OF THE INVENTION

This invention is directed to a further advancement in the field ofelectrical connector assemblies having a snap fit retaining ringcircumscribing the outlet end of a connector body for effecting a snapfit connection to an electrical box of the types described in U.S. Pat.No. 6,860,758, and co-pending application Ser. No. 10/790,283 filed Mar.1, 2004 for Snap Fitting Electrical Connector; and in a co-pendingapplication Ser. No. 11/028,373 filed Jan. 3, 2005, which co-pendingapplications are incorporated herein by reference.

More specifically, this invention relates to a snap fit electricalconnector for facilitating the connection of an electrical connector andassociable cable, wire, conductors or the like to an electrical box,which is provided with a readily detachable snap fit outerfrustro-conical member circumscribing the outlet end of a connector bodyfor simplifying its connection to an electric box and a unidirectionalcable or wire retainer associated with the inlet end of the connectorfor positively securing a wire, cable or conductor to the inlet end ofthe connector so as to prohibit any unintentional separation of thewire, cable or electrical conductor from the connector.

BACKGROUND OF THE INVENTION

Electrical connectors are commonly used for attaching electricalconductors, cables, wires, electrical metal tubing (EMT) or the like toan electric box, e.g. a junction box, outlet box, switch box, fuse box,or other similar type of electric box. Such known electrical connectorsare either of a type that are secured to an electric box by a threadedlock nut or by means of a circular snap fit retaining ring of the typedisclosed in U.S. Pat. Nos. 6,860,758; 6,444,907; 5,189,258; 5,266,050;5,171,164; 2,744,769 and 1,483,218 for example. Reference is also madeto U.S. Pat. No. 6,768,057 which is directed to a right angle typeconnector formed of a pair of sheet metal stampings fitted together andsecured to an electrical box with a snap fit arrangement. Connectorsformed as connector caps which are adapted to be fitted over the end ofa conductor, cable or wires, such as disclosed in U.S. Pat. No.4,880,387, are also known. Various other known efforts to facilitate theconnection of an electrical conductor to an electric box are evidencedby U.S. Pat. Nos. 6,043,432; 6,080,933; 6,114,630; 6,133,529; 6,194,661;6,335,488; 6,352,439; 6,355,884; 6,444,907; 6,555,750; 6,604,400;6,670,553; 6,737,584; 6,682,355; 6,780,029 and 6,849,803. While suchprior known connectors can be satisfactorily used for their intendedpurposes, efforts are constantly being made to improve upon the knownelectrical connectors. The disclosure herein comprises but anothereffort to advance or improve the manner of forming and/or securingelectrical connectors and/or conductors to an electric box.

SUMMARY OF THE INVENTION

An object of this invention is to provide an electrical connector with afrustro-conically shaped retaining ring having integrally formed lockingtangs and electrical grounding tangs.

Another object of this invention is to provide for an electricalconnector assembly that includes an electrical connector body having anoutlet end with a frustro-conical outer surface having a complementaryfrustro-conical retaining ring that is readily fitted to and retained onthe outlet end portion of the connector body.

Another object is to provide a connector assembly comprising a connectorbody having an outlet portion free of any retaining flanges and anassociated snap fit retainer ring circumscribing the outlet end portion.

Another object is to provide a retaining ring having a face portion withoutwardly flaring circumscribing arms or sides having locking andgrounding tangs that are readily formed out of a surface of therespective arms or side.

Another object is to provide a retaining ring, adapted to be fitted ontothe outlet end of a connector body, having a frustro-conical shape witha first series of tangs for securing the connector body relative to anelectrical box and a second series of tangs for effecting a positiveelectrical ground with an associated electrical box.

Another object is to provide a frustro-conically shaped retaining ringthat can be readily formed from a blank of spring steel.

Another object is to provide an electrical connector with afrustro-conical outer retainer ring circumscribing the outer surface ofthe connector outlet end and a unidirectional retainer ring or sleeveassociated with the inlet end of the connector for securing anelectrical wire or conductor thereto.

Another object is to provide an electrical connector with an internalunidirectional sleeve insert for frictionally retaining a wire conductorto the connector so as to prevent any unintentional separation of a wireconductor therefrom.

Another object is to provide an electrical connector with an outerfrustro-conical retainer ring for attaching a connector to an electricalbox with a snap fit and an inner unidirectional retainer ring or sleevefor securing a wire conductor thereto in a manner to prohibit anyunintentional separation of the wire conductor from the connector.

Another object is to provide an electrical connector with an improvedwire retainer sleeve or ring whereby the wire conductor is positivelysecured thereto by simply inserting the wire conductor into theconnector whereby unintentionally separation of the wire conductor fromthe connector is prohibited.

Another object of this invention is to provide an electrical connectorwith a wire retainer ring whereby a helical wound wire conductor can besecured upon mere insertion of the armored conductor wire or bythreading the armored conductor wire into the wire retainer ring so asto prohibit any unintentional separation of the wire conductor from theelectrical connector.

Another object is to provide or an electrical connector assembly that isrelatively simple to fabricate and positive in operation.

Another object of this invention is to provide an electrical connectorassembly having an outer frustro conical retainer ring for positivelyconnecting the connector assembly to an electrical box and havingmultiple inlet ends fitted with an internal wire retainer ring forunidirectional locking therein a wire conductor in each of the multipleinlets.

Another object of this invention is to provide an improved multipleconnector assembly that is relatively simple in structure, easy toassemble and having a minimum of component parts.

Another object is to provide a connector assembly having multiple inletends, each inlet end being fitted with internal spring steel internalretaining ring arranged to maximize electrical conductivity orgrounding.

Another object is to provide an electrical connector having an outerfrustro-conical retainer ring forming a snap fit attachment to anelectric box or panel and having an improved unidirectional wireconductor retainer in the form of a retaining finger projecting into theinlet end of a connector body so as to provide a snap fit wire retentiondevice which prohibits any unintentional separation of the wireconductor form the connector.

Another object is to provide a relatively simple and positive actingsnap fit wire conductor retaining device for securing and retaining awire conductor to an electrical connector in a manner to prohibit anyunintentional separation of a wire conductor from the connector.

Another object is to provide a snap fit wire retainer that extendsinwardly of an electrical connector body constructed so that the wireretainer is externally secured to the exterior of the connector body soas to facilitate the assembly of the connector and associated wireretainer.

Another object is to provide an electrical connector having a wireretainer arranged to be externally secured to the connector in a fixedrelationship relative to the connector so that the free end thereofextends in the inlet end portion of the connector whereby a wireconductor may be snap fitted thereto.

The foregoing objects and other features and advantages are attained byan electrical connector assembly that includes a connector body havingan inlet end portion for receiving an electrical conductor and an outletportion which is adapted to be inserted through a knockout hole of anelectrical panel or electric box, e.g. an electric outlet box or thelike. A radially outwardly extending flange circumscribes anintermediate portion of the connector body to function as a stop tolimit the insertion of the outlet end portion of the connector bodythrough the knockout hole of an electric box. The outlet end portion maybe provided with an outer surface that converges or tapers inwardlytoward the outlet opening thereof. Formed on the surface of the outletend portion are one or more retaining lugs, which may becircumferentially spaced about the outlet end portion. Afrustro-conically shaped snap ring is fitted onto the outlet endportion.

In accordance with this invention, the outer retaining ring is initiallyformed from a blank of sheet material, e.g. spring steel, having acruciform shape that includes a face portion with a central openingwherein the radiating arms of the cruciform blank are disposed about theface portion to define a frustro-conical ring or cup. The ring so formedis provided with blanked out or die cut tangs to define locking tangsand grounding tangs. The frustro-conical ring so formed also has a slotadapted to receive the retaining lug when the retaining ring is fittedonto the outlet end portion of the connector body so that the free ortrailing ends of the ring or grounding tangs engage the inner peripheryof the knockout hole of an electric box for effecting positiveelectrical continuity and grounding.

To form the retaining ring, the cruciform arms are arranged to be foldedrelative to the front or face forming portion of the blank, which isprovided with a central opening, to define a unitary frustro-conicallyshaped cup-like member to compliment or be fitted to the outlet endportion of the connector body. The retaining ring thus formed is fittedover or onto the outlet end portion whereby the retaining slot formed inthe ring is adapted to receive the complementary retaining lug formed onthe surface of the outlet end portion for retaining the ring on theoutlet end portion of the connector body.

With the construction described, the connector assembly can be readilyinserted through the knockout opening of an electric box wherein thelocking tangs will spring outwardly to lock the connector assembly tothe electric box with the grounding tangs or free ends of the arms beingbiased or urged against the internal periphery of the knockout hole toeffect a positive electric ground, due to the inherent resiliency of therespective tangs and the material from which they are formed.

This invention further contemplates providing the inlet end of theconnector with an inner or internal retainer ring which is uniquelyformed for positively securing thereto a wire conductor by merelyinserting the wire conductor into the inner retainer ring, and wherebythe wire conductor is prohibited from being unintentionally separatedtherefrom. The inner retainer ring is preferably formed of a blank ofspring metal material which is rolled to form a cylinder or sleevehaving an outer diameter which can be frictionally retained within theinlet end of a connector, e.g. by a press or friction fit.

A further embodiment of the disclosed invention utilizes a simplifiedclamping arrangement for securing the wire conductor to the inlet end ofthe connector by a mere insertion. In the event the wire conductor has ahelical wound armored shield, e.g. a BX wire conductor, such armoredwire conductor may be alternatively secured to the wire retainer ring orsleeve by threading the armored conductor to the wire retainer ring orsleeve.

A further embodiment of the invention utilizes a connector body havingcomplementary housing or body sections which can be mated together andsecured by a fastener. One of the body sections is formed wih a leadingend that is provided with an outer frustro conical surface and atrailing end having multiple chambers interconnected to the leading endby a transition section. The other body section defines a trailing endcomplementing the trailing end portion of the other housing section. Anouter frustro conical retainer ring circumscribes the leading end toprovide a snap fit connection of the assembled connector body to aknockout hole of an electric box. The respective chambers, defined bythe mated complementary trailing ends, are each fitted with a springsteel retainer sleeve to provide a snap fit connection between a wireconductor and its corresponding inlet end of the assembled connectorbody section. The arrangement is such that the respective wire retaineris securely clamped between the respective body section to provide avery positive surface to surface contact between the wire retainer andthe associated body sections to enhance the electrical continuitybetween the assembled connector body sections and the wire retainerclamped therebetween.

A still further embodiment of the invention utilizes a modifiedconnector body provided with a frustro conical outlet end having afrustro conical shaped external snap fit retaining ring by which theconnector assembly can be readily attached to an electrical panel orelectrical box by a snap fit, and having a uniquely formed wire retainerdevice that clips onto the inlet end of the connector body and isexternally secured to the connector body for enhancing ease of assemblywhile providing the wire retainer to extend into the inlet end of theconnector body with sufficient flexibility and range of movement forretaining a wire conductor or conductor sheath within the connector bodyin a manner to prohibit any unintentional separation of the wireconductor or sheath from the connector body.

IN THE DRAWINGS

FIG. 1 is an exploded perspective view of the electrical connectorassembly.

FIG. 2 is a plan view of the blank from which the outer retaining ringof the present invention is formed.

FIG. 3 is a detail front view of the outer retainer ring.

FIG. 4 is a detail top plan view of the outer retainer ring.

FIG. 5 is a detail end view of FIG. 4.

FIG. 6 is a sectional view of the outer retainer ring taken along line6-6 on FIG. 3.

FIG. 7 is a side view of the connector assembly illustrating thealignment thereof relative to the knockout opening of an electric box.

FIG. 8 is a section side view illustrating the connector assemblysecured to an electric box, taken along line 8-8 on FIG. 10.

FIG. 9 is a sectional side view taken along line 9-9 on FIG. 10 androtated 90°.

FIG. 10 is a fragmentary front view of the connector assembly secured toan electric box as viewed from the inside of the electrical box.

FIG. 11 is an exploded perspective view of a modified form of theinvention.

FIG. 12 is a sectional side view of the modified form of the inventionof FIG. 11.

FIG. 13 is a top plan view of the blank from which the internal wireconductor retainer is formed.

FIG. 14 is a fragmentary top view of a portion of the blank forming theinner retainer sleeve or ring.

FIG. 15 is an end view of the inner wire conductor retainer ring orsleeve.

FIG. 16 is a top view of the inner retainer ring or sleeve of FIG. 15.

FIG. 17 is a section view taken along 17-17 on FIG. 16.

FIG. 18 is a side view of the inner retainer ring or sleeve.

FIG. 19 is a sectional side view of still another embodiment.

FIG. 20 is a perspective view of a further embodiment of the invention.

FIG. 21 is an exploded perspective view of the embodiment of FIG. 20.

FIG. 22 is a top plan view of the embodiment of FIG. 20 having partsthereof broken away.

FIG. 23 is a sectional view taken along line 23-23 on FIG. 22.

FIG. 24 is the interior plan view of one section of the connectorhousing of the embodiment illustrated in FIG. 20.

FIG. 25 is an outer end view of FIG. 24.

FIG. 26 is an end view of the connector housing section of FIG. 24.

FIG. 27 is a sectional view of the housing section taken along line27-27 on FIG. 26.

FIG. 28 is an inside plan view of the complementary housing section ofthe embodiment illustrated by FIG. 20.

FIG. 29 is an end view of FIG. 28.

FIG. 30 is an inlet end view of FIG. 28.

FIG. 31 is a sectional view taken on line 31-31 on FIG. 30.

FIG. 32 is a sectional view taken on line 32-32 on FIG. 28.

FIG. 33 is a perspective exploded view of a further embodiment of theinvention.

FIG. 34 is a top plan view of the blank from which the wire retainerdevice is formed.

FIG. 35 is a side view of the blank of FIG. 34.

FIG. 36 is a side view of the blank of FIGS. 34 and 35 as formed todefine wire retainer.

FIG. 37 is a top view of a slightly modified form of a wire retainer.

FIG. 38 is a perspective view of the connector body embodying theinvention.

FIG. 39 is a side view of FIG. 38.

FIG. 40 is a top plan view of FIG. 39.

FIG. 41 is a left end view of FIG. 38.

FIG. 42 is a right end view of FIG. 38.

FIG. 43 is a perspective view of the assembled connector embodimentshown in FIG. 33.

FIG. 44 is a side sectional view of the connector assembly of FIG. 43.

DETAILED DESCRIPTION

Referring to the drawings, there is shown in FIG. 1 an electricalconnector assembly 10. The connector assembly 10 includes a connectorbody 11, which is usually formed of metal casting, e.g. zinc or othersuitable metallic alloy. The connector body 11 is formed with an inletend portion 11A and an outlet end portion 11B and having a bore 12extending therethrough. Intermediate the connector body 11 or betweenthe inlet end portion 11A and outlet end portion 11B there is provided aradially outwardly extending flange 13 which functions as a stop tolimit the amount that the connector body 11 may be inserted through theknockout hole 14 of an electric box 15, as noted in FIG. 8.

As shown in FIGS. 1 and 8, the outer surface S of the outlet end portion11B slopes, tapers or converges toward the outlet opening 16 whereby theouter surface S of the outlet end portion 11B has a generallyfrustro-conical configuration. Formed on the surface S of the outlet endportion 11B is an outwardly projecting retainer lug 17. In theillustrated embodiment, two such lugs 17 are shown disposed 180° apartabout the outer circumference of the outlet end portion 11B.

The connector assembly 10 also includes a snap fit retaining ring 18. Inaccordance with this invention, the retaining ring 18 is integrallyformed from a blank 19 of spring steel material. As best seen in FIG. 2,the blank 19 is initially formed or stamped to define a generallycruciform shape. The cruciform shape is provided with a face portion 20having central opening or hole 20A and having four generally radiallyextending arms defining two pairs of oppositely disposed arms AA and BB.

As illustrated in FIG. 2, the opposed pair of arms AA are each providedwith a retaining slot 21. The opposed pair of arms BB, as best seen inFIG. 8, are blanked or formed to define a locking tang 22 and to eitherside thereof an electrical grounding tang 23, 23. As shown, the lockingtang 22 is slightly shorter than the adjacent grounding tangs 23, 23.The arrangement is such that the free end of the locking tangs 22 areformed so as to engage the inside surface of the electric box 15 in theassembled portion, as best seen in FIG. 9, to secure the connectorassembly 10 to the electric box 15 and prohibit any unintentionalwithdrawal of the connector assembly 10 from the electrical box 15,whereas the free ends of the grounding tangs 23 are biased in engagementwith the internal periphery of the knockout hole 14. Also, the free ends24, 24 of arms AA in the assembled position will also function aselectrical grounding tangs, as noted in FIG. 8.

In forming the retaining ring 18 from blank 19, the respective arms AAand BB are subjected to a series of progressive bending dies which willgradually bend the respective arms about a foldline f, which defines theface or front portion 20, whereby arms AA and BB form a cup havingcircumscribing frustro-conical or outwardly flaring sides to define afrustro conical ring 18 which complements the conical surface S of theleading or outlet end portion 11B, as seen in FIG. 1. In doing so, thelocking tangs 22 are outwardly and cantileverly bent or displacedrelative to the surface of the ring at a slightly greater outwardlyangle or slope than the adjacent grounding tangs 23 and the slope ofarms AA. With the retaining ring 18 so formed, it can be readily fittedonto the outlet end portion 11B whereby the inherent resiliency of thearms AA will cause the retainer slots 22 to snap fit onto the retaininglug 17 when slots 21 are placed in alignment with lugs 17. Thearrangement is such that the retainer ring 18 will be firmly andpositively secured to the outlet end portion 11B as seen in FIG. 8. Yet,due to the inherent resiliency of the material of the retaining ring 18,it can be easily detached from the outlet end portion 11B when removalis desired, without destroying the ring 18 by lifting arms AA free ofthe retaining lugs 17.

With the retainer ring 18 properly secured to the outlet end 11B of theconnector body 11, the connector assembly 10 can be readily secured toan electric box 10 by simply aligning the assembly 10 with a knockouthole 14, as best seen in FIG. 7, and inserting the leading or outlet endportion into the knockout hole 14 until the flange 13 engages the outerside of the electric box 15. In doing so, the tangs 22, 23 and the freeends 24 of arms AA, respectively, will depress inwardly to permitinsertion of the assembly 10. When the assembly is fully seated in theknockout hole 14, the locking tangs 22 will normally spring outwardly tosecure the assembly 10 to the electric box 15, as noted in FIG. 9. Theinherent resiliency of the grounding tangs 23, 23 and the free end 24 ofarms AA are normally biased in engagement with the internal periphery ofthe knockout hole 14 to ensure a positive electrical ground with theelectric box 15. The engagement of the free ends 24 of arms AA againstthe inner periphery of the knockout hole 14, as noted in FIG. 8, furtherensures the firm securing of the retaining slot 21 with the retaininglugs 17, so as to prohibit any disengagement of the outer retaining ring18 from the connector body 11.

It will be understood that the wire conductor 25 may be secured to theconnector assembly 10 either before or after the assembly 10 has beensecured to the electric box 15. In the illustrated embodiment, theconductor wire 25 is simply inserted into the inlet end portion 11A andsecured in position by a suitable securing means. In the illustratedembodiment of FIG. 1, the securing means is illustrated as a set screw26. However, it will be understood that other conventional forms ofsecuring means may be used, than the set screw 26 illustrated.

From the foregoing, it will be apparent that the disclosed connectorassembly is quite novel and simple in construction. The snap fitretaining ring 18 can be simply formed from a cruciform shaped blank 19whereby the opposed radially extending arms AA and BB can be readilyformed into a cup having a generally frustro-conically shaped sidewallscomplementing the slope of the outlet end portion 11A, and whereby theouter retainer ring 18 can be readily secured to the connector bodysimply by the interengagement of slots 21 with its complementary lugs17.

In the assembled position, the outer retainer ring 18 is positivelysecured to the connector body in a manner to prohibit any unintentionalseparation. Also the tangs 22 and 23, which are formed integral withring 18, are shaped and formed so that the locking tangs 22 secure theassembly 10 to an electric box 15 while the grounding tangs 23 ensure apositive electrical ground of the assembly 10 with the associatedelectric box 15.

FIG. 11 illustrates a perspective view of a modified form of theinvention. As illustrated in FIG. 11, the connector assembly 30 includesa connector body 31 which may be formed as a casting form of a suitablemetal or alloy, e.g. zinc and the like, as hereinbefore described. Theconnector body 31 includes a conically shaped outlet end 31A similar tothat described with respect to FIG. 1, and a cylindrical inlet end 31B.A circumscribing internal shoulder 31C is formed intermediate theopposed ends of the connector body 31. As shown in FIG. 12, the internalshoulder 31C defines the demarcation between the bore 32A defining theoutlet end 31 and the bore 32B defining the bore of the inlet end.Circumscribing the connector body 31 about the exterior thereof is aradially outwardly extending stop flange 33.

The outlet end 31A of the connector body 30 is provided with opposedretaining lugs 37 adjacent the outlet opening 36. Circumscribing thesloping or conical surface S of the outlet end 31A is the outerretaining ring 38, similar to that hereinbefore described with respectto FIGS. 1 to 10.

In the embodiment illustrated in FIG. 11, the connector assembly 30includes an internal wire retainer 39 in the form of a ring, cylinder orsleeve which is fitted to the bore 32B of the connector body 31, andwhich retainer 39 functions as a unidirectional retainer means arrangedto permit a wire conductor to be readily inserted and secured thereinto,and which will resist any applied force imparted to the wire conductorin the opposite direction to prohibit any unintentional separation ofthe wire conductor from the connector body 31. Wire conductor, as usedherein, means any wire, cable, helical wound metal covering or sheath(BX) wire, plastic sheath wire conductor and the like.

Referring to FIGS. 13 to 15, the internal retainer 39 is preferablyformed from an elongated blank 40 of spring steel. The retainer blank40, as best seen in FIG. 13, comprises an elongated generallyrectangular blank having a longitudinal leading edge 40A, a trailingedge 40B and opposed end edges 40C and 40D. End edge 40C is providedwith a pair of spaced apart notches 41, 41 and a projecting tongue 42.The other end edge 40D of blank 40 is provided with a pair of projectingtongues 43, 43 arranged to complement notches 41, 41 and a complementarynotch 44 for receiving tongue 42 in the formed or rolled position of theretainer sleeve 39, as shown in FIG. 18.

Blanked, lanced, cut or stamped out of the plane of blank 40 are one ormore tangs 45. In the form of the invention as shown in FIG. 13, tangs45 are formed out of the plane of the blank. The respective tangs 45 arebifurcated to define a pair of finger tangs 45A, 45A longitudinallyspaced along the longitudinal axis of the blank 40 at a distance, which,when the blank 40 is rolled to form the retainer sleeve 39, therespective pairs of finger tangs 45A are oppositely disposed, as bestseen in FIG. 15.

As shown in FIGS. 15 and 18, the respective finger tangs 45A, 45A areinwardly bent out of the plane of the retainer sleeve 39. In theillustrated embodiment, the respective finger tangs are provided with apair of intermediate transverse fold lines F₁ and F₂ whereby the freeend of the respective finger tangs is directed toward the longitudinalaxis of the sleeve 39, as shown in FIG. 18.

Referring to FIG. 15, it will be noted that the retainer sleeve isprovided with a flattened portion 46 on one side thereof.

The connector body of FIGS. 11 and 12 may be formed with an internalcomplementary flat surface along a portion of the inner circumferencethereof. The arrangement is such that the retainer sleeve 39, wheninserted into the inlet end 31B of the connector body, is oriented sothat the flattened surface 46 of the sleeve 39 complements the internalflattened surface 47 of the connector body. The orientation is such thatthe opposed finger tangs 45A are oppositely disposed to firmly grip thewire conductors, e.g. an armored conductor or other covered conductor.

The outer circumference of the inner retainer sleeve or ring 39 isproportioned so that it can be press fitted or frictionally fitted intothe inlet end 31B of the connector body 31 by a force sufficient tofirmly secure the inner retainer ring or sleeve 39 within the inlet endso as to prohibit any separation of the retainer ring or sleeve 39 fromthe inlet end of the connector body. The complementary flattenedsurfaces 46 of the internal sleeve 39 and 47 of the inlet end of theconnector body insures proper orientation of the internal sleeve 39within the inlet end of the connector body.

FIG. 14 illustrates a fragmentary portion of the blank 40 to show anintermediate step in forming the tang fingers 45A, 45A so that when theformed blank 40 is rolled to form the internal retaining sleeve, thetang fingers will be disposed in parallel as seen in FIGS. 15 and 16.This is attained by fold line F₃ which is disposed at an angle, as notedin FIG. 14, so that when the blank is rolled to form the internalretaining sleeve 39, the tang fingers 45A, 45A will be disposed inparallel. The free ends 45B of the respective fingers 45A are angularlyoffset to engage the grooves of an armored conductor, as noted in FIG.12 or other covering sheath of a wire conductor that will resist a forceattempting to effect separation of the conductor from the connectorassembly. The respective free ends 45B may also be laterally offset sothat an armored conductor may be threadedly connected to the internalsleeve 39, as well as by simply inserting the armored covered conductorinto the retainer sleeve to effect a snap fit connection.

FIG. 19 illustrates a further embodiment of the invention. Theembodiment of FIG. 19 is directed to a connector assembly 50 which isgenerally similar to that disclosed in FIGS. 1 to 10. The embodiment ofFIG. 19 differs from that disclosed in FIGS. 1 to 10 and FIGS. 11 to 18in that the connector body 51 is provided with a slotted opening 52 inthe inlet end 51A thereof positioned adjacent to the radially outwardlyextending flange 53. Intermediate between the inlet end 51A and theflange 53, the inlet end is provided with a tapped or threaded hole 54for receiving a set screw 55.

In this form of the invention, the wire retainer means comprises aninverted U shape clamp 56 having opposed leg portions 56A, 56B and aninterconnected web 56C. The web 56C is provided with an aperture or hole57 arranged to be disposed in alignment with the tapped or threaded hole57. The web 56C is sufficiently wide so that one leg, e.g. leg 56B, isextended through the slotted opening 52 and the other leg 56A extendsover the inlet opening 58 to the inlet end portion 51A. The retainingclamp 56 is adjustably secured to the connector body 51 by the set screw55 extending through the aligned tapped hole or screw hole 52. By havingone leg 56B extending through the slotted opening 52 and the other leg56A extending over the inlet opening 58, the clamp 56 can be readilyadjusted relative to the connector body by turning the set screw 18 inone direction or the other. The arrangement is such that as the setscrew 55 is tightened, the opposed and spaced apart free ends of therespective clamp legs 56A, 56B will exert a bearing force on the wireconductor sheath to positively secure a wire conductor to the inlet endof the connector assembly. In all other respects, the connector assemblyof FIG. 19 is similar to that disclosed in FIGS. 1 to 10, and need notbe repeated.

FIGS. 20 to 32 are directed to a further modification of the disclosedinvention. As best seen in FIGS. 20 and 21, the connector assembly 60includes a housing or connector body formed of a pair of complementarysections or members 61 and 62. The respective complementary sections ormembers 61 and 62 are preferably formed as casting of any suitable metalor alloy material, e.g. zinc, aluminum and the like.

As best seen in FIG. 21, one of the housing complementary members, e.g.61, is provided with a projecting leading or outlet end 61A, which isadapted to be inserted through a knockout hole 14 of an electric box orpanel 15. The leading or outlet end 61A is formed with an annularconfiguration to define an outlet opening 63, through which theconductor leads or wires 80A may extend as noted in FIG. 20. The outersurface S of the leading end 61A slopes or tapers downward toward thecentral axis of the connector assembly to define a frustro conical outersurface S on the leading end 61A.

The complementary member 61 also includes a trailing or inlet end 64. Asshown in FIG. 21, the trailing or inlet end 64 is formed as a pair ofsemi-cylindrical chambers 64A, 64B disposed in parallel side by sidearrangement separated by an intermediate wall or division 65. Theopposed ends of the respective chambers 64A, 64B are defined between aninturned lip 66A circumscribing the inlet opening 66 to the respectivechambers 64A, 64B and a transverse web 67. A transition section 68connects the respective chambers 64A-64B to leading or outlet end 61A.

Extending through the intermediate wall 65 is a tapped hole 68B havinginternal threads. Also formed on the wall 65 is an aligning depressionor recess 69. Circumscribing the leading or outlet end 61A is a radiallyoutwardly extending flange 70 which functions as a stop to limit thedistance the connector assembly 60 can be inserted through a knockoutopening 14 of an electric box or panel 15.

The complementary housing section or member 62 is formed with a pair ofsemi-cylindrical chambers 64A′, 64B′ disposed in parallel relationshipand arranged to complement chambers 64A, 64B in the assembled positionof the respective housing members 61, 62, as best noted in FIGS. 20 and31. Housing member 62 is provided with a hole 71 extending therethroughwhich is arranged to be disposed in alignment with the tapped hole 68Bwhereby the respective housing sections 61, 62 can be secured in theassembled position by a threaded fastening screw 72 inserted throughhole 71 and threaded into the tapped hole 68 of the other housing member61. Housing member 62 is also provided with a transition section 68Athat complements transition section 68 of the other housing member orsection 61.

To facilitate the alignment of the two housing sections 61 and 62 inassembling the sections 61, 62, there are provided complementaryaligning means. In the illustrated embodiment, the aligning meanscomprises a notch 73 formed at the leading end of the housing member 62which is arranged to mate with a complementary projection or lug 74formed on the outlet end portion of the housing member 61. Anotheralignment means includes a recess or depression 69 formed in thedividing wall 65 of housing member 61 arranged to be disposed inalignment with the projection or dimple 69A formed on the dividing wall65A of housing member 62.

In this form of the invention, the outlet or leading end 61A is providedwith retainer lug 75 projecting outwardly from the conical surface S ofthe outlet end 61A. In the illustrated embodiment, two such retaininglugs 75 are oppositely disposed. Disposed about the outer sloping ortapered surface S of the outlet end 61A is a frustro-conical retainerring 76. The conical retaining ring 76 is formed and constructed in themanner hereinbefore described with respect to FIGS. 2 to 4 and need notbe repeated. As seen in FIGS. 20 and 21, the frustro conical externalretainer ring 76 can be readily slipped onto the outlet end 61A so thatupon engagement of the retainer lugs 75 with the complementary slots 76Aformed on the retainer ring 76, the retainer ring 76 is maintained inposition on the external surface S of the leading or outlet end 61A ashereinbefore described.

In this form of the invention, a wire conductor retainer ring or sleeve77 is arranged to be disposed and clamped between the complementarychambers defined by the respective housing sections or members 61, 62when assembled. The respective wire retainer rings or sleeves 77 aresimilar in construction and function to that described with respect toFIGS. 13 to 16, which need not be repeated. It will be noted thatdividing wall 65, 65A of the respective housing members 61, 62 arearranged to engage the flat area 77A of the respective wire retainersleeves 77 thereby functioning as a means for effecting properorientation of the respective wire retainer sleeves 77 within theirrespective chambers in the assembled position of the housing sections ormembers 61, 62.

To assemble the connector 60 of FIGS. 20, 21, a formed conductor wireretainer ring 77 as hereinbefore described, is position in eachsemi-cylindrical chamber defined in one of the housing sections, e.g.,as illustrated in FIGS. 21 or 22; noting that the flat portion 77A ofthe respective wire conductor retainer sleeves 77 are positioned againstthe adjacent opposing surfaces 65B of the dividing wall 65, as best seenin FIG. 23. In this position, the opposite ends of the respectivesleeves 77 abut the interior lip 66A adjacent the inlet opening and thetransverse web 67. With the wire retainer rings 77 thus positionedwithin their respective chamber, the other housing member, e.g. member62, is fitted to housing member 61 whereby the respective housingsections clamp the respective wire retaining sleeves 77 therebetween asthe fastening screw 72 is rotated to secure the two housing sectionstogether as shown in FIGS. 20 and 23. It will be noted that the outerdiameter (OD) of the wire retainer sleeves 77 are substantially equal toor slightly greater than the internal diameter of the respectivechambers in the assembly position of the housing sections 61, 62, asnoted in FIGS. 20 and 23. The arrangement is such that the respectiveretainer sleeves 77 are firmly secured within their respective chamber,when assembled, so that the wire retainer sleeves are prohibited frombeing separated from the connector body or housing. With the housingmembers 61, 62 thus secured, the external retainer ring 76 can bereadily fitted onto the leading end 61A of the connector body orhousing, as hereinbefore described.

With the connector body of FIG. 20 thus assembled, it will be noted thatthe connector assembly 60 can be readily secured to an electric box orpanel simply by inserting the leading or outlet end 61A through aknockout hole of a panel or electrical box so as to be readily securedthereto with a snap fit as hereinbefore described. Also with thearrangement described, a wire conductor or cable can be readily attachedto the trailing end of the connector assembly 60 with a simple snap fit.

FIG. 20 illustrates a wire conductor having an external helically woundsheath or outer covering 80 which can be readily inserted through theinlet opening of one of the respective chambers formed in the trailingend whereby the gripping tangs 78 formed in the wire retainer sleeves77, as hereinbefore described, securely grips the armored cable or wireconductors with a snap fit, the arrangement being such that the wire sosecured is prohibited from becoming accidentally separated from theconnector body, as hereinbefore described. While a conventional armoredtype conductor 80 is illustrated in FIG. 20, it will be understood thatthe described connector assembly herein can be suitable for use withother types of wire conductors, e.g. conductors having an externalplastic or fabric like sheath.

By simply removing the single fastening 72, the entire assembly can bereadily taken apart to effect the separation of the wire conductor if sodesired. If desired, the transition portions 68, 68A of the respectivehousing sections 61, 62 may be provided with peep holes 70 to view theindividual conductor wires 80A arranged within the connector body tofacilitate an electrical installation.

From the foregoing, it will be noted that the connector assembliesdisclosed herein utilize a frustro conically shaped outer retainer ringwhich is uniquely secured to the leading end of a connector body, withsecuring tangs and grounding tangs arranged to effect both a positivesecurement of the connector assembly to a knockout hole of an electricbox or panel and a positive electrical ground. In association with anexternal frustro conical retaining ring, other disclosed embodimentsinclude a trailing end constructed to receive one or more wireconductors and retaining the same to the connector body with a simplesnap fit motion. While the embodiment of FIG. 20 has been illustratedand described as having a duplex trailing end portion, it will beunderstood that the subject matter described can be utilized with one ormore chambers formed in the trailing end of the connector body describedherein, depending upon the number of wire conductors one may wish toconnect to a single connector body.

With respect to the embodiment of FIGS. 20 to 32, the arrangement issuch that the connector body, being formed of two component housingsections, and secured together with a fastener as described imparts aclamping force onto the spring steel wire retaining ring or sleeve witha surface to surface contact to enhance electrical conductivity orgrounding between the component housing sections, and the wire retainingsleeves clamped therebetween.

FIGS. 33 to 44 illustrate a further modification of the invention. Inthis embodiment, the connector assembly 80 includes a connector body 81,an outer frustro conical external snap-fit retainer ring 82, a wireretainer device 83, and an optional plastic electrical insulating endring insert 84.

As shown, the connector body 81 includes an inlet portion 81A and anoutlet portion 81B, formed as a casting of a suitable metal, e.g. zincor other suitable metal alloy. The inlet portion 81A, for the greaterportion thereof, is defined by a cylindrical body having a circumferencewhich is greater than 180°, and preferably about 320° plus or minus afew degrees. The open portion of the cylindrical body defining the inletend portion 81A, as viewed in FIGS. 33 and 43, is provided with a flatclosure 85 which is integrally connected to the opposed edges of thecylindrical body by interconnecting opposed side walls 85A and 85B.Projecting outwardly of the flat closure 85 is an anchoring pin or boss86.

The outlet portion 81B comprises a frustro conical end similar to thathereinbefore described with respect to the embodiments of FIGS. 1, 11,19 and 21. Also, the external snap fit ring 82 adapted to be disposedabout the outlet end portion 81B is structurally and functionallysimilar to that hereinbefore described, and need not be repeated.

In the embodiment of FIGS. 33 and 44, a wire retainer or device 83 isarranged to extend into the inlet portion 81A, whereby a wire conductor90, adapted to be inserted into the inlet portion 81A, is retainedtherein merely by inserting the wire conductor into the inlet endportion 81A. The arrangement is such that the wire conductor 90, onceinserted into the inlet portion 81A and past the free end 83C of thewire retainer 83, positively retains the wire conductor 90 so as toprohibit any unintentional separation of the wire conductor 90 from theconnector body 81, as best seen in FIG. 44.

The wire or conductor retainer 83 is formed from an elongatedrectangular blank 87, preferably a blank of spring steel. The blank 87is provided with a plurality of longitudinally spaced apart transversefoldlines F₁ to F₆, whereby the blank 87 can be readily formed to definethe spring steel retainer 83.

As shown, the elongated blank 87, intermediate the length thereof andadjacent the longitudinal edges 87A, 87B, is provided with die cut orslit 87C to form opposed projecting prongs 88 that are bent out orproject beyond the plane of the blank 87. The right end of the blank 81,as seen in FIG. 35, is reversely bent or folded about foldlines F₁ andF₂ so as to overlie the projecting prongs 88, as best seen in FIG. 36,whereby the reversely bent end 83A is spaced above the projecting prongs88. Formed in the bent end 83A is an aperture or hole 89 which ispositioned to receive anchor pin or boss 86 in the assembled position.The portion of the blank 87 to the left of the prongs 88 are bent abouttransverse foldlines F₃, F₄, F₅ and F₆ at longitudinally spacedintervals to configure the blank 87 with a series of angular bends, asshown in FIG. 36. The angle of respective bends about the respectivefoldlines F₃ to F₆ is not critical and may vary depending upon theinternal diameter of the inlet end 81A. As shown in FIG. 44, theretainer device 83 may be angularly bent so that the free end 83Bextends to a position sufficient to engage the wire conductor or thewire covering or sheath 90, as noted in FIG. 44.

In the illustrated embodiment, the wire conductor, as shown, includes atypical helically wound metallic sheath or covering 90 that houses theconducting insulated wires 90A. To facilitate the retention of thesheath 90, the free end of the retainer device 83 may terminate in acurvilinear arc 83B to complement the circumference of the sheath 90disposed between the adjacent helical ridges as best seen in FIG. 44.

To assemble the wire retainer 83 to the inlet portion 81A of theconnector body 81, the reversely bent end portion is fitted to orclipped onto the end of the flat closure or top 85, as best seen inFIGS. 43 and 44 so that the anchoring pin 86 is received in the hole 89.To secure the retainer device 83 to the connector body 80, the top ofthe anchor pin is swedged so as to deform the end of the anchor pin 86,whereby the deformation of the anchor pin 86 firmly and fixedly securesthe retainer device 83 to the connector body. In the swedging operation,the prongs 88 formed in the blank 87 are caused to “bite” into the undersurface of the flat closure or top 85, as best seen in FIG. 44, toenhance the attachment of the retainer device 83 to the connector body81. To complete the assembly of the connector assembly, the frustroconical external ring 82 is snap fitted onto the conically formed outerend portion 81B as hereinbefore described. While the means for securingthe wire retainer 83 to the connector body portion 81A is described bymeans of a swedged pin, it will be understood that other suitablefastening means may be used, e.g. screws, bolts, welding, solder and thelike.

As will be best noted in FIG. 44, the retainer device is so formed thatthe free end 83B is arranged to extend into the inlet portion 81A of theconnector body 81 and is angularly disposed so as to enable a wireconductor or sheathing 90 to be unidirectionally inserted into the inletend portion 81A so as to be retained by the free end 83A of theretaining device 83 in a manner whereby the wire conductor 90 isprohibited from being unintentionally separated from the connector body.

To effect the release of the wire conductor, one need only to insert anappropriate tool to effect displacement of the retainer device away formthe wire conductor or covering sheath 90, to effect the withdrawal ofthe conductor sheath 90.

FIG. 37 illustrates a slightly modified wire retainer device 91. Themodified wire retainer device 91 is similar to that the wire retainer83, herein described, with the exception that the free end of the blank91A is provided with an end notch 92 to define a pair of finger portions93 for engaging and retaining a wire conductor, as hereinbeforedescribed. In all other respects, the structure of embodiment FIG. 37 issimilar to the wire retainer 83 as described.

To complete the connector assembly 80, an end ring insert 84 may beprovided to protect the wire conductors 90A that extend beyond theoutlet end 81B, as noted in FIG. 44. The illustrated ring inset 84preferably formed of a suitable plastic, comprises a ring body 84Ahaving an outwardly radially extending flange 84B. Blanked out of theplane of the ring body are opposed tangs 84C which are outwardly bent.The outer diameter of the ring body 84A is slightly smaller than thediameter of the opening 82A formed in the face portion of the externalretainer ring 82. The arrangement is such that the ring insert 84 can bereadily snap fitted to the opening 82A of the external retainer ring 82and the outlet opening of the outlet end portion 81B. The insert bodytangs 84C function to enable the ring insert 84 to be readily snapfitted to the outlet end portion 81A, so that the ring insert 84 isprohibited from being unintentionally separated therefrom.

Intermediate the opposed opening of the connector body, there isprovided a radially outwardly projecting stop flange 95, which functionsto limit the insertion of the connector assembly through a knock-outhole of an electric panel or electric box, as hereinbefore described.

While the present invention has been described with respect to severalembodiments, it will be understood that various modifications may bemade without departing from the spirit or scope of the invention.

1. An electric connector assembly comprising: a connector body having aninlet end portion, and an outlet end portion, a radially outwardextending stop flange formed about an intermediate portion of saidconnector body, and a snap fit retaining ring having a face portion andan integrally connected circumscribing frustro-conical configurationwherein the diameter of the trailing end of said frustro-conicalconfiguration is greater than the diameter of the leading end thereof,said circumscribing frustro-conical configuration includes a lockingtang and a grounding tang formed out of the surface of said retainingring, means for securing said retaining ring onto said outlet endportion of said connector body, and a wire conductor retainer connectedto said inlet end portion of said connector body for effecting aunidirectional snap fit connector of a wire conductor thereto.
 2. Anelectrical connector assembly as defined in claim 1 wherein said wireconductor retainer comprises: an elongated blank having opposed ends,one end of said blank being reversely bent so as to be spaced from theremaining portion of said blank, and said remaining portion of saidblank being angularly bent about transverse, spaced apart foldlines, andmeans for securing said reversely bent one end to said connector bodyexternally thereof whereby said bent remainder portion with said angularbends extends into said inlet end portion of said connector body.
 3. Theconnector assembly as defined in claim 2 wherein: said securing meansincludes an anchor pin extending outwardly from an outer surface of saidconnector body adjacent said inlet end portion, and a complementary holeformed in said reversely bent end of said wire retainer, saidcomplementary hole being arranged to receive said pin in the assembledposition of said wire retainer.
 4. An electrical connector assembly asdefined in claim 3 wherein said anchor pin is deformable to secure theanchor pin within said hole.
 5. An electrical connector assembly asdefined in claim 1 wherein: said inlet end portion includes a flattenedsurface, and a connected curvilinear portion, said anchor pin extendingoutwardly from said flattened surface, said reversely bent end of saidwire retainer being clipped onto the end of said flattened portion sothat said anchor pin is received in said hole of said reversely bent endof said wire retainer, and said remainder portion of said blank havingsaid angular bends extending into said inlet portion for unidirectionalretention of a wire conductor adapted to be inserted in said inlet endportion of said connector body.
 6. An electrical connector as defined inclaim 1 wherein said wire conductor retainer comprises: an elongatedblank formed of a resilient material having opposed ends and opposedlongitudinal edges, said blank having opposed prongs projecting beyondthe surface of said blank adjacent one end thereof, said one end beingreversely bent to overlie in spaced relationship to said prongs, and theremaining portion of said blank being transversely bent at spaced apartintervals, said reversely bent end being clipped onto the inlet endportion of said connector body, said prongs providing a grip to maintainthe wire retainer in place.
 7. An electrical connector for effecting theconnection of the electrical connector to an electric panel having aknock-out opening with a unidirectional snap fit and for securing a wireconductor to the electrical connector with a unidirectional snap fitcomprising: a connector body having an inlet end portion having an inletopening and an outlet end portion defining an outlet opening, a borecommunicating said inlet opening to said outlet opening, an externalsnap fit retaining ring circumscribing said outlet end portion, saidexternal snap fit retaining ring includes locking tangs and groundingtangs blanked out of the material of said retaining ring, and a wireconductor retainer connected to said inlet end portion, said wireconductor retainer comprising an elongated blank formed of a resilientspring material, said blank having opposed ends, one of said opposedends being reversely bent so as to be spaced from the remaining portionof said blank, said remaining portion of said blank being angularly bentabout spaced-apart transverse foldlines to extend into said bore of saidinlet end portion, and securing means for connecting said wire conductorretainer to an external portion of said connector body.
 8. An electricalconnector as defined in claim 7 wherein said blank includes a prongblanked out of the plane of said blank adjacent said reversely bent end,said prong projecting beyond the surface of said blank, whereby saidprong grips the internal surface of said inlet opening.
 9. An electricconnector as defined in claim 8 wherein said securing means includes: ananchor pin projecting outwardly of the outer surface of said inlet endportion, and a hole formed in said reversely bent end of said wireretainer, said hole being arranged to receive said anchor pin in theassembled position.
 10. An electric connector as defined in claim 9wherein said anchor pin is deformable to secure said wire conductorretainer to an exterior surface of said outlet end portion, and saidprong disposed to bite into the inner surface of said inlet end portionto maintain said wire retainer in place in the assembled position. 11.An electrical connector as defined in claim 7 and including an end ringinsert fitted to said outlet opening of said outlet end portion, saidring insert including a ring body having an outer diameter slightly lessthan said outlet opening, a radial outwardly flange circumscribing saidring body, and outward projecting tangs formed out of the plane of saidring body for locking said ring insert in the inserted position toprohibit unintentional separation of said ring insert from said outletopening.
 12. An electrical connector assembly comprising: a connectorbody having an inlet end portion with an inlet opening and an outlet endportion defining an outlet opening, a stop flange disposed between saidinlet end portion and said outlet end portion, said outlet end portionhaving an outer frustro-conical surface, a frustro-conical external snapfit retainer ring circumscribing said outer frustro conical surface,means for detachably securing said external retainer ring on said outerfrustro-conical surface, said inlet end portion including a curvilinearbody portion and a flattened body portion, an anchor pin projectingoutwardly of said flattened body portion adjacent to said inlet opening,a resilient conductor retainer, said conductor retainer including areversely bent end portion to define a clip for attaching said wireretainer to said flattened portion of said inlet end portion at saidinlet opening, whereby the remainder portion of said conductor retainerextends into said inlet end portion, and said reversely bent portion ofsaid conductor retainer includes a hole for receiving said anchor pin inthe assembled position for securing said conductor retainer to theexterior of said inlet end portion.
 13. An electric connector as definedin claim 12 wherein said conductor retainer includes a projecting prongarranged to bite into the under surface of said flattened body portionof said inlet end portion.
 14. An electric connector assembly forsecuring an electrical conductor to an electric box comprising: aconnector body having an inlet end portion, and an outlet end portion,and a bore extending therethrough, said outlet end portion terminatingin an outlet opening for insertion through a knock out hole, said outletend portion having an outer surface that slopes downward toward saidoutlet opening, a radially outward extending stop flange formed about anintermediate portion of said connector body, and a retaining ring havingan integrally connected circumscribing frustro-conical configurationwherein the diameter of the trailing end of said frustro-conicalconfiguration is greater than the diameter of the leading end thereof,said circumscribing frustro-conical configuration having a locking tangformed out of the surface of said ring and a grounding tang, means forsecuring said retaining ring onto said downwardly sloped outlet endportion of said connector body, and a wire conductor retaining meansconnected to said inlet end portion adjacent said inlet opening, saidwire conductor retaining means being formed as an elongated strip of aresilient material, said strip including reverse fold at one end thereofto define a clip end arranged to be clipped onto said inlet end portion,and a remainder portion, said remainder portion being angularly bent atspaced apart intervals therealong so as to extend through said inletopening and into said inlet end portion.
 15. An electric connector asdefined in claim 14 wherein said strip includes a projecting prongblanked out of said strip adjacent said clip end whereby, in theassembled position, said prongs engage the inner surface of said inletend portion.